package api;

import cn.hutool.json.JSONUtil;
import common.ApplicationVariable;
import lombok.SneakyThrows;
import model.ResultData;
import model.UserInfo;
import util.DBUtil;
import util.SessionUtil;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;

@WebServlet("/deldish")
public class DelDishServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int state = -1;
        String msg = "未知错误";
        // 验证登录信息
        UserInfo userInfo = SessionUtil.getSessionUserInfo(req);
        if (userInfo != null) { // 已经登录
            Integer did = Integer.parseInt(req.getParameter("did"));
            if (did != null && did > 0) {
                // 参数有意义，执行删除操作
                Connection connection = DBUtil.getConnection();
                // todo:删除之前，要先确认订单详情表没有使用此菜品才行
                String sql = "delete from dish where did=?";
                PreparedStatement statement = connection.prepareStatement(sql);
                statement.setInt(1, did);
                int result = statement.executeUpdate();
                DBUtil.close(null, statement, connection);
                state = result >= 1 ? 200 : -1;
            } else {
                msg = "参数错误";
            }
        }
        // 将结果返回给前端
        resp.setContentType(ApplicationVariable.RESPONSE_CONTENT_TYPE);
        resp.getWriter().println(
                JSONUtil.toJsonStr(
                        new ResultData(state, "", msg)
                )
        );
    }
}
